iPhone X OLED Screen Burn in
Hi, I started to have shadows or "burn in" effect on my iPhone X OLED screen. I didn't notice it until I used a white background or using note app. Then I realised that there some sort of shadow of icons still showing on the screen. I did a screen capture but it didn't showed in the photo taken. My iPhone X is still within warranty and I wonder if anyone had this issue and what should I do next. Appreciate the help. Thank you.
iPhone X, iOS 12.0.1